.travis.yml: Delete

Service is no longer around.

.travis.yml

@@ -1,41 +0,0 @@
-language: c
-
-matrix:
-  include:
-    - os: osx
-      osx_image: xcode10.2
-    - os: osx
-      osx_image: xcode9.4
-    - os: osx
-      osx_image: xcode9
-    - os: osx
-      osx_image: xcode8.3
-    - os: osx
-      osx_image: xcode8.2
-    - os: osx
-      osx_image: xcode8.1
-    - os: osx
-      osx_image: xcode8
-    - os: osx
-      osx_image: xcode7.3
-    - os: osx
-      osx_image: xcode6.4
-    - os: linux
-      env:
-        - secure: "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"
-      addons:
-        coverity_scan:
-          project:
-            name: "9fans/plan9port"
-            description: "Build submitted via Travis CI"
-          notification_email: 0intro@gmail.com
-          build_command: "./INSTALL"
-          branch_pattern: master
-
-before_script:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew cask install Caskroom/cask/osxfuse; fi
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-; fi
-
-script:
-  - ./INSTALL